Child of God: Is everyone a child of God, or are just Christians? [I John 3, Genesis 4, John 8:39, Acts 17:28, Luke 15:11-32, John 1:12]. Derek Prince-Demons: What do you think about Derek Prince's book , "They Shall Expel Demons"? [I John 4:4, 5:18, I Corinthians 6:19-20].